Patients sitting down thigh root pain, the common clinical reasons are mainly the following: a. patients with bone necrosis due to sitting down thigh root sustained stress, will cause local pain symptoms, at this time can improve the magnetic resonance examination of the hip joint clear femoral head necrosis, recommended as soon as possible to perform surgery femoral head replacement can completely relieve the symptoms of thigh root pain. Second, patients with sciatic nerve injury may experience sciatic nerve compression at the hip when sitting down, which is manifested as radioactive pain at the root of the thigh, at this time, patients can avoid sitting for a long time and causing sciatic nerve compression, and can improve sciatic nerve pain symptoms by taking nerve-nourishing drugs such as oral microphysics. If the sciatic nerve pain is more obvious and seriously affects the life of the patient, local closed anesthesia can be used to reduce the pain at the root of the thigh.